Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 4 (ENGINE CONTROLS SELF-DIAGNOSTICS - 5.0L & 5.7L)DIAGNOSTIC TESTSDTC P0121: TP SENSOR PERFORMANCECODE ENABLE CRITERIA
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 F
Code Enable Criteria
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 FSECTION Code Enable Criteria
WARNING: This page is about a different variant/trim than selected.
- Engine is running.
- Barometric (BARO) pressure is not in default.
- Throttle position is steady.
- DTCs P0112, P0113, P0122, P0506, or P0507 are not set.
DTC sets when throttle position is more than calculated throttle position for more than 5 seconds.
Or
DTC sets when throttle position is less than calculated throttle position for more than 5 seconds.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.